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L. BRACCO. MOLD MACHINE FOR CONCRETE BUILDING BLOCKS.

APPLICATION FILED IUL I. 1916.

Patented July 8, 1919.

2 SHEETS-SHEET I.

lA/l/E/VTOR Jaw 134m WITNESSES:

BI' ATTORNEY THE COLUMBIA PMNOORAPH 60., WASHINdTON. D. C.

L. BRACCO.

APPLICAT ON FILED JULY I. I916- 2 SHEETS-SHEET 2.

BIA PLANOGRAPH (10-, WASIHNGT certain new and useful Improvements in i LoursnngAoco, or

P T N OFFICE.

NEW YORK, N. Y.

MoLD MAdHfiiiJ ro R concer ssrinnmesmcxs.

T a llwhom it mag/'bneemx Be it known that I, Hours 'BRACCO, a'citizenof the United States, and a resident of the boroughof the Bronx, county,cityand State of New York,ha've invented Mold-Machines for ConcreteBuilding- Blocks, of whichthe following is a specifica tion.

My present inventionis more or less-particularly adapted for use in theproduction of concrete buildinoblocks such as are illustrated anddescribec in my pending application, Serial No. 97,6 17,'filed May 15tl1, 1916 forconcrete building blocks and has for its object theproduction of blocks, molded in the form of two separated block sectionshaving air spaces between them but united by means'of stirrup's orwirebails',the air spaces being provided to prevent the transmission ofmoisture from one -of the block sections to its'com'panion blocksectionand the stirrups or wire bails beingp'rovided to bridge such interveningair space.

To this end my invention comprises a novel arrangement of parts "to behereinafter described.

In the accompanying drawings, Figure 1 represents a plan view ofmyconstruction;

Fig. 2 represents a side elevation thereof; Fig. 3 representsa frontelevation thereof;

Fig. 1 represents a section taken on line 4.4ofFig.2'; J

Fig. 5 represents aside-elevation, partly in section with'the mold boxin tilted position; I Fig. 6 represents a detail in perspective of oneof the end cores of the mold-box, and Fig. 7 represents as'ecti'onalView similar to Fig. 4 showing a modified form of core.

Like reference numerals represent like parts in the several figuresillustrating the embodiment of my invention.

In these drawings 10-10 represents 'a pair of beams which areintersected by crossbeams 11-11 to form a frame or stand whereon amold-box 19 and associated parts are supported. This frame or stand alsosupports a turntable to be hereinafter described.

Mold-box 19 is mounted upon an angular frame formed of a pair of bars 31, (shown in Fig. 2 in a vertical position) said bars beingcross-connected at their upper ends by a cross-bar 35. At their lowerends these bars 34 are intersected by and secured to a pair Ste-mam ofIietters Patent.

Patented July 8, 1919.

91s. seriaiimie mzi.

shown at 18 to a block 16 secured on the turntable 13 so that said frameand its mold-box 19 may be tilted at right angles from the positionshown in Fig. 5 to the position shown in Fig. 2. Fig. 2 illustrates themold-box when itis in position for removal 'of the cores and of thefinished concrete block. The angular frame when in the position of Fig.2 issupported by brackets 16", while when in the-position of Fig. 5 itis supported by the horizontal bar 16.

The mold -box 19 comprises three side walls 20, 20 and 20, each of saidside walls being hingedly secured, asshown at 34, to the parallel bars34 of the angular frame, so that they may be swung from verticalposition (which is the normal position while the box 19 is being filled)downwardly to a position to permit of the removal of the finished cementblock. A hinged top plate 21 and a base plate or pallet 22 are providedand comprise with the side walls 20, v2O and 20", the five inclosingpanels for the mold 'box 19, leaving the opening 19 through and withsmaller cores 24, the latter of which being made removable from thecores 23, if desired, and being provided with ree'e's'ses 25 formaintaining in position during the molding of the block a wire stirrupor tie 26, which tie, becoming embedded in the concrete during themolding of the block sections 26 and 26* serves firmly and permanentlyto unite the two separated block sections 26 and 26 of my concrete blockconstruction. A central removable core 29 and two adjacent smallerremovable cores 80-30, one at either side of the central core 29 andprojecting into abutment with the cores 24:, comprise the center coresfor my block box and provide for the separating air space between theblock sections, thus keep- Q j V 1,sos,sse-

ing them from contact with one another, as best shown in Fig. 4 of mydrawings.

The turntable which supports the moldbox when being filled comprises astationary platform 13 and a superimposed platform 15, the latter beingrevoluble relative to the platform 13 by means of a ball race 14. Thetwo platforms are held in proper relative position by means of a pin orpivot 17 passing centrally through both platforms. By revolving theplatform 15, the mold-box may be brought into any desired positionrelative to the operator.

Fig. 5 represents the mold-box after the bottom of the mold-box has beencovered with concrete and after the cores 29, 30, 23 and 24 as wellasthe stirrup or bail wires 26 have been placed in position as shown insaid figure. Additional concrete (which may be in a more or less plasticstate) is thereupon supplied to the box and jammed into it by means of atamper until it is filled flush up to the open side 19 of the mold-box.The block will thus be formed in the desired shape as determinedby thecores and the wire will have become embedded in the cement of theoppositely located block sections 26 and 26 and, bridging the spacebetween them will firmly bind these sections together. To remove thecement block sections the box 19 is tilted to the position of rig. 2,the cores 29 and 30 are removed, the

side walls 20, 20, 20 and the cover 21 are thrown open on their hingesand the pallet 22 upon which the cement block is now supported is liftedout.

In Fig. 7 I have shown my mold-box with the side cores 23 and 24 removedfrom one of the side walls, this mold being intended for the formationof corner blocks. In this view I have shown a core 37 swung on .a rod 38by means of eyelets 39 in core 37. This core 37 comprises three parts,the main part 40, the angular hinged extension 41, and the hinged stayplate 42 which holds the angular extension 41 in its operative position.In addition to the cores 2324 afiller core 43 may be inserted to givethe block the shape shown.

V Vhen the corner block, for which this construction of cores isdesigned, is completed the stay plate 42 is swung upwardly to giveslight play to the angular extension 41 so that the core 37 may bewithdrawn without undue binding in theconcrete.

I have shown more particularly in F ig. 3 of the drawings perforationsin the crossbars 35 and 34 whichmay be provided for the purpose ofenablino'the mold-box to be extended in its lengthwise direction.Obviouslv when the mold-box is so extended a pallet 22 and a cover 21 ofappropriate length would have to be substituted to make up for suchelongation. If my mold-box should be adjusted to certain fixeddimensions for the block sections and it be desired to reduce suchdimensions, it will be necessary only to insert extra cores or blocks inthe mold as adjusted, whereby, naturally, a block of reduced. dimensionswould be molded.

While I have shown my invention in one specific form of construction, itwill be understood that the same may be practised in numerous otherforms and in connection with a variety of dimensions as to both theblock box proper and the cores and the me tallic tie shown in mydrawings, without departing from the spirit of the invention. This istrue also of numerous details of construction which may be varied atwill without avoiding the essence of my device.

lVhat I claim is:

A mold box for forming concrete building blocks provided with aremovable center core, removable cores of reduced width at oppositesides of said centercore, a pair of hinged side walls for said box, anin wardly extending core secured upon each of said walls, an additionalinwardly extending removable core of reduced width carried by each ofsaid last named cores, said cores being adapted to forma block in twoseparate sections having projections extending toward each other, and ametallic tie sup ported between said pairs of cores of reduced width toengage said projections and connect said separate sections LOUIS BRACCO.

Copies of this patent may beiobtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

